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Blood pressure
- 2. When theventricles contract a force is exerted against the wall of arteries, This causes a high pressure in the arteries , This is called systolic pressure
- 3. Away fromthe aorta the pressure falls gradually And in the capillaries there is no pressure During systole 70ml of blood is forced into the arteries Normal systolic pressure is120mm hg
- 4. When theheart relaxes,the pressure within the arteries diminishes. This pressure is called diastolic pressure
- 5. A person’sblood pressure is expressed using the values of both the systolic pressure and the diastolic pressure. The normal blood pressure is 80- 120mmHg The apparatus used for measuring blood pressure is called sphygmomanometer.
- 7. When the ventriclescontract, the blood in the right ventricle enters the lungs through the pulmonary arteries From the lungs the oxygenated blood flow back to the left atrium This circulation is called pulmonary circulation
- 8. When theventricles contract,the blood in the left ventricle flows to the different parts of the body through the aorta and its branches. This blood come back to the heart and enters the right right atrium through the venacavae This circulation is called systemic circulation
- 10. During onecardiac cycle,blood passes through the heart two times, So it is called double circulation The pulmonary circulation and systemic circulation are completely separate.
- 12. lungs oxygen ated blood pulmonary vein R.V PULMONARY CIRCULATION L.Atrium R.A SYSTEMIC CIRCULATION Venacavae Aorta veins D.OXY .B OXY.BL arteries Pulmona ry artery
- 13.